★★★★★ 1
Short arms
Fit was very weird with short arms
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 30, 2025
Active Air-TimerDeliver growth boosting CO2 with our user friendly, easy to operate system. With its programmable timer, it will automatically maintain ideal CO2 levels for optimum growth. For small to medium size areas, select the COSYS; for larger than 10' x 10' areas, select the COSYS20. To use Hydrofarm's CO2 Flow Rate Calculator, click HERE NOTE: Current COSYS & COSYS20 now come equipped with a black rubber O ring that has replaced the white plastic washer.
Quick Dispatch:
Your Active Air-Timer orders ship within 1-2 business days.
Delivery Options:
- Standard: 3-7 business days
- Fast: 2-3 business days
- Express: 1-2 business days
Order Tracking:
You'll receive a tracking link by email once your Active Air-Timer ships.
Need Help?
Questions about Active Air-Timer, sizing, or delivery? We're just an email away.
Live Shipping Estimates:
Enter your location at checkout to see available shipping methods and costs for Active Air-Timer in your area.
Get Shipping Estimates
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
You may also like
4.8 ★★★★★
Based on 2333 reviews
Sort
Product Reviews
★★★★★ 5
Size
Size: 18.5" Neck 36"-37" Sleeve, Color: White
Quality is good, fabric soft.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 13, 2022
★★★★★ 3
It’s just not the most comfortable cotton
Size: 16.5" Neck 34"-35" Sleeve, Color: Blue Bay
Looks good, fits well, but it’s just not the most comfortable and breathable material. It’s the short you ll grab last in your closet
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 6, 2022
★★★★★ 2
Too large, too plastic-y
This shirt was supposed to be "regular fit" but "mega obese" is more like it, absolutely nothing in common with the picture. Also the fabric was polyester-plastic-shiny, I don't believe that it's almost pure cotton.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 26, 2021
★★★★★ 3
nice shirt
Size: 18" Neck 32"-33" Sleeve, Color: White
nice shirt
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 4, 2022
recommand products
Mountain Plumbing MT9122-NL- Oval Handle Lavatory Sweat Supply Kit
225.50
Mountain Plumbing MT760- Lift & Turn Lavatory Drain Without Overflow. 1
152.59
Mountain Plumbing MT1831-NLD- Mb Mini Hot & Cold Faucet W/ Brn Lever & Spout Tip
290.90
Tenzo QUT44- Extenza Valve Quantum Thermo. 4 Functions
606.75
Mountain Plumbing BWO40S22P2- New Sch40 1-1/2 Pvc W/Swivel Ball Joint
201.96